221442868 has 6 divisors (see below), whose sum is σ = 387525026. Its totient is φ = 110721432.

The previous prime is 221442863. The next prime is 221442877. The reversal of 221442868 is 868244122.

It can be written as a sum of positive squares in only one way, i.e., 174821284 + 46621584 = 13222^2 + 6828^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221442863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27680355 + ... + 27680362.

Almost surely, 2^221442868 is an apocalyptic number.

It is an amenable number.

221442868 is a deficient number, since it is larger than the sum of its proper divisors (166082158).

221442868 is a wasteful number, since it uses less digits than its factorization.

221442868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55360721 (or 55360719 counting only the distinct ones).

The product of its digits is 49152, while the sum is 37.

The square root of 221442868 is about 14880.9565552756. The cubic root of 221442868 is about 604.9979445779.

The spelling of 221442868 in words is "two hundred twenty-one million, four hundred forty-two thousand, eight hundred sixty-eight".